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SOUTHERN REGIONAL POWER COMMITTEE BANGALORE
Minutes of the 28th Meeting of Protection Coordination Sub-Committee
of SRPC held on 24.01.2014
1. Introduction
1.1 The 28th Meeting of Protection Coordination Sub-Committee (PCSC) was
held on 24th January 2014 in the Conference Hall of Southern Regional
Power Committee, Bangalore. The list of participants of the PCSC meeting is enclosed as Annexure - I.
1.2 Shri S. R. Bhat, Member Secretary i/c, SRPC welcomed the Members and
Participants to the 28th Meeting of the Protection Coordination Sub-
Committee.
1.3 Member Secretary i/c, stated that as the forum was aware Southern
Regional Grid had been synchronized with NEW grid thus forming NEWS
Grid on 31st December.2013. He added that issues relating to NEWS Grid
operation such as SPS operation etc needed to be discussed in this
meeting.
1.4 Member Secretary i/c, also briefed the forum regarding CERC petition No
146/MP/2013 with I.A 36/2013 regarding provision of protection systems for
ensuring Security of the SR Grid. He urged the constituents to initiate timely
action to rectify the issues enlisted in the petition. He mentioned about the
operationalisation of PSDF fund as posted in the MOP website for
reference. He stated that all SR constituents needed to have a harmonized
approach in improving the protection system in the Region as a whole. He
requested for submission of phasing of implementation of Protection Audit
Recommendations by APTRANSCO, APGENCO, TANTRANSCO, KPTCL,
KPCL and Puducherry to at the earliest.
1.5 Member Secretary i/c said that trippings that had occurred at Guttur 400/220
kV substation on 24.12.2013 and 12.01.2014 would be discussed in the
Meeting. A Protection Expert Group would also be visiting 400 KV KPTCL
Guttur S/S on 29th January 2014 to analyze the Incidences.
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 2
1.6 MS i/c, SRPC requested the constituents to submit the report/data relating
to Grid occurrences/incidents as specified in the Indian Electricity Grid
Regulations.
2. Confirmation of the Minutes of the 27th PCSC Meeting held on 19th December-2013
The Minutes of the 27th PCSC meeting were confirmed with the following
corrections.
Recommendations in item 3.c, 3.d, 3.e, 3.f, 3.g and 3.i ,"APTRANSCO" to be
replaced with "APGENCO".
3. Grid Disturbances (GD) in Southern Region
3.1. GD at KPTCL 400 KV Guttur S/S on 24.12.2013
(i) Date and Time of event 24.12.2013 at 21:13 Hrs (ii) Location Guttur, Karnataka
(iii) Plant and/or Equipment directly involved
400 KV KPTCL Substation
(iv) Reported Disturbance / Fault Complete Outage of 400 KV Guttur S/s (v) Generation Loss 100 MW to JSW , No Load Loss
(vi) Duration of interruption 20 Minutes to 1 Hr 40 Minutes (vii) Category GD 1
The Analysis Report of KPTCL and SRLDC are enclosed as Annexure – II &
as Annexure – III respectively.
Deliberations& follow up • As per analysis report of KPTCL, maintenance of 400 kV breaker of Jindal
feeder was being carried out at 400 kV Guttur station and line was charged
through transfer bus breaker.
• While restoring from Transfer breaker to Main breaker, the Main breaker of
Jindal feeder got accidentally energized due to suspected DC earth fault.
• This led to a 3 phase fault in 400 kV bus at Guttur station as the earth switch
was in closed condition. The 3 phase fault was sensed and cleared by bus
bar protection.
• Since the entire station was on a single 400kV bus, operation of bus bar
protection led to tripping of all connected feeders.
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 3
• SRLDC informed that Synchrophasors data indicated that occurrence of 3
phase fault and timely clearance of fault i.e. in 80 ms time.
• KPTCL informed the forum that all the recommendations of the Protection
Expert Group in respect of Guttur 400/220 substation had been completed
including the wiring for dual DC sources for two trip coils of CB and provision
of bus couplers for 400 kV and 220 kV buses.
• SRLDC pointed out that CEA (Grid Standards) Regulations, 2010 mandated time
synchronization of E/L and D/R at 220 KV and above voltage level
substations. KPTCL replied that as these features have been included in the
DPR .Tendering process was underway and these features would be
completed soon.
• ED, SRLDC also pointed out that CEA (Technical Standards for Connectivity
to the Grid) Regulations, 2006 stipulate that numerical relays needed to be
provided at the substation. It was also stressed by SRLDC that all the
relevant records are to be made available by the utility owning the substation
for fault trip investigation.
• MS i/c informed that a meeting of Protection Expert Group had been
scheduled to be held at Guttur on 29th January.2014.The group would
analyze trip events that occurred on 24.12.2013 & 12.01.2014 at Guttur
substation.
Recommendations • The recommendations of Protection Expert Group 5 held at Guttur on 29th
January.2014 is enclosed here as Annexure IV.
3.2. GD at KPTCL 400 KV Guttur S/S on 12.01.2014
(i) Date and Time of event 12.01.2014 at 12:25 Hrs (ii) Location Guttur, Karnataka
(iii) Plant and/or Equipment directly involved
400 KV KPTCL Substation
(iv) Reported Disturbance / Fault Complete Outage of 400 KV Guttur S/s (v) Generation Loss 735 MW
(vi) Duration of interruption 36 Minutes to 2 Hr 20 Minutes. (vii) Category GD 1
The Analysis Report of KPTCL and SRLDC are enclosed as Annexure – V &
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 4
as Annexure – VI respectively.
Deliberations
• It was informed that 400 kV Distance relay at Guttur end sensed Y ph to earth fault. Breaker of 400 kV Guttur- Hiriyur line-2 did not open at Guttur end.
• Auxiliary trip relay (ABB make RXMM-1) provided in the single phase trip circuit of 400kV Hiriyur (Beeranahalli) ckt-II line was found faulty.
• DC fuse fail occurred in the 400kV Hiriyur (Beeranahalli-II) Line control panel.
• No monitoring provided for detecting DC fuse fail.
• Y-B phase fault cleared in 400kV Guttur-Hiriyur line-1 from both ends.
• It was noted that the fault persisted for 5 seconds which is unusually long duration.
• KSEB queried why LBB did not operate despite CB not acting for 5 seconds long duration at one end though other end tripped.
• It was opined that due to high resistance fault resulting in lower fault current CB did not trip.
• KPTCL informed that only current was observed there in the auxiliary relay but no trip signal. KPTCL opined that single phase earth fault (resulting in neutral voltage shift) caused high voltages on healthy lines that led to O/V tripping of all the lines at the bus.
Recommendations The recommendations of Protection Expert Group 5 held at Guttur on 29.01.2014 is
enclosed here as Annexure-IV.
4. Grid Incidences in the Southern Region
Deliberations
The Grid Incidences that had occurred during Decemeber-2013 and January 2014 were discussed in the PCSC meeting and the details (deliberations and recommendations) of the meeting are enclosed herewith as Annexure - VII.
5. CERC Order dated 19.12.13 in respect of Petition No. 263/MP/2012
• SRPC letter regarding implementation of Hon'ble CERC order is enclosed as Annexure – VIII and the order enclosed as Annexure IX.
• SRLDC briefed about the contents of Hon’ble CERC Order in respect of
Petition No 263/MP/2012.
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 5
• SRLDC requested APTRANSCO, KPTCL, KSEB and TANTRANSCO to
initiate steps to map the feeders connected to the UFR, df/dt loads in the
respective SLDC control panel within the time frame stipulated in the CERC
order.
• MS i/c, SRPC also requested the above constituents to map UFR, df/dt relays .The status of compliance of the order could please be sent to SRPC Secretariat by 20.02.2014.
6. Operation of SPS of 765 kV Raichur-Sholapur line at 17:03 hrs
on 03.01.13 (SRLDC Agenda) SRLDC informed that SPS gets operated when the power flow on line exceeded 800 MW. The load shedding in Southern Region through this SPS is triggered by activation of the trip signal-3 at Kolar (Trip signal-3 is intended for load relief on tripping of HVDC Kolar OR f 765kV Sholapur-Raichur line). Tamilnadu had reported that load shedding due to SPS action whereas no load shedding was reported from Karnataka, Kerala & Andhra Pradesh. The non-receipt of signal/ non-tripping of loads needed further investigation. It was requested to check the connectivity from DTPC to desired loads at the respective locations according to the details provided by POWERGRID for 765kV Raichur-Sholapur SPS and if required to check the signal transmission from Kolar to respective DTPC location on one to one basis in co-ordination with POWERGRID Kolar Actions taken by A.P, Kerala and Karnataka could please be furnished to the PCS committee.
Deliberations • It was brought to the PCSC forum that on 2nd January 2014 the SPS had not
operated due to certain problems in the Logic and the issue was addressed.
• It was informed that the SPS had operated 7 times from 31/12/13 to 24/1/2014.
• SRLDC informed that on 23rd January 2014 the mock testing of SPS had been conducted (Annexure -X).
• MS i/c, SRPC brought to the notice of the forum that TANTRANSCO had raised matter about the frequent tripping of loads due to operation of SPS.
• SRLDC contended that for that additional loads would be required from the constituents for any proposal for rotational tripping of loads.
• It was brought to the notice of the forum that same loads would be affected during the operation of SPS on Wardha- Parli Line / Sholapur – Raichur Line .
• KPTCL stressed that SPS logic may need to be reexamined since even for 100-200 MW range of power import at times the SPS operates.
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 6
• MS i/c suggested that SPS triggering events for upstream and downstream may need to be segregated.
• It was noted that in the NEW grid, two generators had been earmarked for SPS operation due to the flow on Wardha - Parli line.
• SRLDC informed that at times , SPS at Agra –Gwalior line is operating on account of SR under drawal .
• MS i/c, SRPC suggested for refinement /review of the existing SPS for Sholapur / Raichur lines by NLDC/SRLDC.
• SRLDC informed the forum that they would be discussing the matter with NLDC for refinement /review of SPS. SRLDC said that studies would need to be carried out before refining the existing SPS.
• KPTCL suggested that the existing ‘geophysical locking’ sort of load shedding operation downstream of Nelamangala on account of SPS operation may need to be relooked..
• It was suggested that SRPC secretariat may write to NLDC regarding refinement of SPS.
7. Additional SPS Scheme for 765 KV Raichur Sholapur Line
Spl TCC and Spl Meeting of RPC Deliberations
• The issue of providing Additional SPS Scheme for 765 KV Raichur Sholapur Line was discussed in the Spl meeting TCC held on 11.01.2014 at SRPC, Bangalore.
• In the Spl TCC it was discussed that during Operation Over Current Protection (800 Amps or 1000 MW for 10 seconds) in 765 KV Sholapur Raichur Line during import by SR while the frequency was less than 50.2 Hz.
• In the meeting SRLDC suggested that 800 MW load shedding in SR could be triggered using the already identified load for Kudankulam SPS.
• In the Spl.TCC the constituents agreed in principle for implementation of additional SPS and would be deliberated in the forth coming PCSC meeting.
• In the Spl meeting of SRPC held at Hyderabad the Constituents agreed in principle for the implementation of the additional SPS for an initial period of 6 months. This would be during operation of Over Current protection (800 Amps or 1000 MW for 10 seconds) in 765 kV Sholapur-Raichur line during import by SR while the frequency was less than 50.1 Hz using the already identified load for Kudankulam SPS.
Deliberations
• SRLDC presented the requirement of additional SPS in PCSC forum.
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 7
S. No Contingency Action
1 Operation of Overcurrent protection (800 A or 1000 MW for 10 sec) in 765kV Sholapur-Raichur line (Import by SR) and frequency <50.1 Hz
800MW load shedding in Southern region (Newly identified load for Kudankulam can be triggered )
• The PCSC forum recommended for implementation of additional Logic
for the 765 KV Sholapur Raichur Line w.e.f 27.01.2014 by SRTS I ,
PGCIL.
8. SPS for Kudankulam Nuclear Power Station SRLDC brought to the notice of the PCSC forum that there had been re-orientation in respect of 400 KV lines emanating from Kudankulam. Three 400kV lines are from Kudankulam to Thirunelveli while remaining one line is from Kudankulam to Madurai. Hence the following logic was proposed for SPS at Kudankulam on account of the change in the configuration:
Contingency Action
Tripping of all three lines from Kudankulam to Thirunelveli
and two units in running condition at Kudankulam.
One unit at Kudankulam to go on house load and the second unit generation would be evacuated through 400kV Kudankulam-Madurai line.
27th PCSC Deliberations • NPCIL informed that they had addressed a letter to PGCIL for revision of
existing 700 MW limit to a higher limit on KKNPP – Madurai line after the SPS operation.
• SRLDC stated that the conductor from KKNPP to Thirunelveli is Quad type and from Thirunelveli to Madurai is of twin-moose type.
• NPCIL was of the opinion that as per the study undertaken by them it was feasible to evacuate full power on the line to Madurai.
• PCSC forum requested NPCIL to implement the proposed SPS in consultation with the CTU/SRLDC at the earliest.
Deliberations
• SRLDC informed the forum that PGCIL had replied to NPCIL and
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 8
suggested KKNPP to restrict the generation to House Load on a Generator and 700 MW on other Generator.
• KKNPP, NPCIL informed that they would revert back within three week's time.
9. Single Phase Auto Reclosing Facility for KKNPP Lines • KKNPP stated that consent has been obtained from Russian agency for
implementing A/R feature on the 400 kV lines connected to KKNPP.
• It was noted that PGCIL had submitted their settings to KKNPP. KKNPP informed that some circuits have to be modified for the A/R feature and hence the settings were sent to their HQ, Mumbai and awaiting their direction.
• NPCIL also informed that nuclear reactor safety is paramount important to them and as per the related IEEE document A/R feature is not recommended for lines connected to nuclear power plants.
• NPCIL further stated that A/R feature is not there lines connected to KGS and MAPS nuclear plants in SR grid. SRLDC informed that A/R feature has been enabled on the lines connected to Narora nuclear power plant.
• MS i/c informed that there was no participation from KKNPP in the last OCC meeting of SRPC and this A/R issue has been discussed in SRPC meetings also.
• It was decided in the meeting that KKNPP would furnish the updates by next PCSC meeting.
10. Status of Pending Protection issues Pending protection issues were discussed in the 28th PCSC meeting and the details are enclosed as Annexure - XI.
11. Phasing of Implementation of Protn. Audit Recommendations
• In the 23rd SRPC meeting held on 26th October 2013 it was agreed that the utilities to carry out implementation of the recommendations relating to third party protection audit as per prioritization in a phased manner.
• The schedule of activities would be furnished with in one month and would be discussed in the Protection sub committee meeting.
• The utilities would commence works identified in the above schedule without waiting for funding.
Deliberations
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 9
• It was brought to the notice of the forum that APTRANSCO had submitted the Phasing on 24.01.2014.They have said that they have included 7 no of 400 KV substations and 18 No of 220 KV Substations.
• ED, SRLDC informed the forum that they had submitted the suggested implementation of phasing of Protection Audit recommendations to Hon’ble CERC.
• KPTCL informed that they were planning to implement the protection Audit recommendations in a single phase and would be submitting the same shortly.
• TANTRANSCO informed th forum that they would be submitting phasing of implementation of protection audit recommendations shortly.
• Member Secretary, i/c requested the constituents to consider a harmonized way of phasing of implementation of protection audit recommendations and submit the same to the SRPC Secretariat at the earliest.
12. Tripping Incidents in the Southern Region The tripping details that had occurred in the Southern Region during the month of December 2013 is attached herewith as Annexure-XII. The PCSC forum requested Constituents to update the details in the SRLDC Website at the earliest to analyze the incidents and suggest remedial measures if any.
13. Status of implementation: SPS in Southern Region Status of implementation of SPS in Southern Region was discussed in the meeting and the details are enclosed as Annexure - XIII.
14. Implementation of Islanding schemes in SR Deliberations TANTRANSCO informed that they had implemented the Stage-II of the Islanding Scheme w.e.f 10.01.2014 (Annexure XIV).
15. The issue of AUFR/AUFLS stages and implementation in SR In the second NPC Meeting, it had been agreed that there would be four stages for AUFLS starting with 49.2 Hz. The various stages for AUFLS operation are 49.2 Hz, 49 Hz, 48.8 Hz and 48.6 Hz.
Deliberations TANTRANSCO informed that they had implemented the Stage-IV of the UFR Load Shedding Scheme w.e.f 10.01.2014 (Annexure XV).
Minutes of the 28th Protection Coordination Sub Committee Meeting held on 24.01.2014 Page 10
16. Submission of completed dynamic study data
Deliberations • All SLDCs were requested to direct the embedded IPPs connected at
220 KV and above voltage level to submit completed dynamic study format to SRPC, Secretariat.
17. Informing configuration changes to PCSC forum It was agreed in the PCSC forum that if any change in the system configuration ( i.e. addition of Generating Units, Capacitors, Reactors, LILO etc) at 220 kV and above level are to be highlighted and brought to attention of PCSC forum during the PCSC Meetings. This would enable utilities to review their protection settings, if any, and to have better protection coordination in the Southern Region.
18. Non Participation in the PCSC Meetings. PCSC forum took serious Note on the non Participation of Constituents (i.e. SRTSI (PGCIL), APGENCO) in the Protection Coordination Sub committee Meetings. On account of non-participation, Protection related issues of the above said constituents affecting the other utilities could not be discussed in the PCSC meeting.
19. Date & Venue of the next Meeting
29th PCSC meeting would be conducted on 20.02.2014 (Thursday ) at SRPC Bangalore.
Member Secretary i/c thanked all the Members & participants for their active contribution in the Meeting.
*********
substation on Complete Outage of 400/220kV Guttur substation on 24-12-2013 at 21:14 hrs and 12-01-2014 at 12:25 hrs
Tripping at Guttur on 24-12-2013 at 21:14 hrs• All connected 400kV lines and ICT’s tripped
• As per analysis report of KPTCL, maintenance of 400kV breaker of Jindal feederwas being carried out at 400kV Guttur station and line was charged throughtransfer bus breaker.
• While restoring from Transfer breaker to Main breaker, the Main breaker of Jindalfeeder got accidentally energized due to suspected DC earth fault.
• This led to a 3 phase fault in 400kV bus at Guttur station as the earth switch was inclosed condition. The 3 phase fault was sensed and cleared by bus bar protection.
• As the entire station was on a single 400kV bus, operation of bus bar protectionled to tripping of all connected feeders.
• Synchrophasor data indicates occurrence of a 3 phase fault and the timelyclearance of fault i.e. in 80 ms time.
Voltage dip of 100kV observed all the three phases at 400kV Narendra station
Current rise observed all the three phases of 400kV Narendra-Kiagaline
Multiple tripping at 400/220kV Guttur Station of KPTCL
at 12:25 hrs on 12th January 2014
All connected lines and ICT’s at 400/220kV Guttur station got tripped at 12:25 hrs on 12-01-2014.
There was a delayed clearance of fault i.e, 4.9 seconds which was analysed with the D.R & E.L of
respective stations along with SCADA SOS & Synchrophasor data at SRLDC.
Sequence of Events
Brief Analysis of the event:
Y phase to earth fault had occurred in 400kV Guttur-Hiryur Line-2 at 12:27:45.960 hrs. The
fault was cleared from Hiryur end at 12:25:47.990 hrs. The distance protection at Guttur
end had sensed the fault in 400kV Guttur-Hiryur line-1. However the fault was not cleared
and it appears that the Y pole breaker at Guttur end did not open. The fault in 400kV
Guttur-Hiryur line-2 was being fed by 400kV Guttur bus through the connected lines and
ICT’s.
After 2.11 seconds of occurrence of fault in 400kV Guttur-Hiryur line-2, a Y-phase to earth
fault occurs in 400kV Guttur-Hiryur line-1 at 12:25:50.070 hrs. After 380 ms of occurrence
of fault in y-phase, a 2nd
fault occurs in B-Phase of 400kV Guttur-Hiryur line-1. The fault in
400kV Guttur-Hiryur line-1 was cleared from both the ends.
The Y-phase to earth fault in 400kV Guttur-Hiryur line-2 was persisting. Due to less fault
current there the distance relay Zone-2 and Zone-3 did not sense the fault. 400kV Guttur-
JSW, 400kV Guttur-Munirabad, 400kV Guttur-Narendra line-1&2 tripped on operation of
directional earth fault protection at JSW, Narendra & Munirabad ends respectively. The
fault ampere in neutral was around 1200 A. The fault was cleared when all connected lines
tripped from remote ends and ICT’s at Guttur tripped.
From synchrophasor data it can be observed that the fault in Y-Phase was persistent for
nearly 4.84 sec which matches with the Sequence of events created with Station D.R & E.L
and SCADA SOE. The time of occurrence of 2nd
fault in 400kV Guttur-Hiryur line-1 also
matches with the PMU time.
Points for further discussion:
1) As per report of SLDC, Karnataka the distance protection had sensed the fault and
operated. However breaker of 400kV Guttur-Hiryur line-2 did not open due to failure
of single phase auxiliary trip relay and failure of protection DC at Guttur. In the event
of failure of 220V DC -1, the Main-2 protection & its auxiliary relay fed through the
2nd
DC source should have tripped the breaker. Even if one trip coil was unhealthy,
the 2nd
trip coil should have got activated through main-2.
2) In the event of non- tripping of breaker of 400KV Guttur-Hiryur line-2 at Guttur end,
the LBB protection should have got activated as the distance relay had sensed the
fault and breaker was in closed condition. However the LBB protection also didn’t
operate in this case as fault was fed for nearly 4.9 seconds. This needs further
investigation.
3) From SCADA SOE of KPTCL it was observed that ICT-1 HV breaker had tripped 153 ms
after occurrence of fault in 400kV Guttur-Hiryur line-2. Whether definite time or
IDMT characteristics is provided for ICT back up earth fault protection. Review
required for ICT back up earth fault protection.
4) As per KPTCL report, there is no monitoring for DC fuse and circuit in the existing
scheme for failure of RXMM -1 relay and DC fuse. The same to be incorporated in
protection scheme.
5) Direct trip was received at Kaiga power station from Guttur end. The reason for
direct trip needs to be furnished.
6) Tripping of LV breaker of both ICT’s and HV breaker of ICT was not recorded in
SCADA SOE of SLDC. Same needs to be checked and rectified.
7) The D.R for lines at Guttur station is not time synchronized with GPS. For Kaiga
power station D.R to be wired for direct trip receive at Kaiga station.
X-----------------------x--------------------------------X
Mock Testing of Trip Signal – 3• Mock Exercise for Trip Signal – 3 was conducted on 23rd January 2014 12:30
with SRLDC code 550 • It was received at the following places initially
• After receiving of the Signal at the respective ends, SRLDC code no 556 was given to all constituents to normaize the trip links.
• At 400kv Nelamangala there was wiring problem between OPGW and DTPC, which was later corrected and then the Signal was tested subsequently
• Similary, at 200Kv pallom S/S also it was tested later and confirmed.
1
Annexure-XIII
Status of SPS implementation a. Status of implementation: SPS in Southern Region
SN
Name of the Scheme Details of the scheme
Implementing Agency
28th PCSC Deliberations
PCSC Recommendations /Rem
arks 1 SPS for 765 KV
Sholapur Raichur Line
Flow > 800 MW (direction of flow
: Sholapur to Raichur).
PGCIL (Action
(i) Trip 500MW load in southern region. (ii) 500MW generation reduction in W.R )
(i)Raipur and Sholapur ends will send command to Kolar.
(ii) Initially these signals could be used to trip loads as per Trip Signal 3 of Talcher-Kolar.
(iii)Later loads to be made different from Talcher-Kolar & Kudankulam SPS
The Mock testing of SPS was done on 23.01.2014.(Mock Test Report –Annexure )
- Rate of change of flow crossing
400 MW/second in the Sholapur to
Raichur direction.
Loss of import on 765 kV Sholapur
Raichur by more than 800 MW due
to tripping of these lines.
2 Additional Logic for SPS for 765 KV Sholapur Raichur Line
Operation of Over current
protection (800 A or 1000 MW for
10 sec) in 765kV Sholapur-Raichur
line (Import by SR)
and
frequency <50.1 Hz
SRTS I,PGCIL (Action 800MW load shedding in Southern region (Newly identified load for Kudankulam can be triggered )
- The PCSC forum recommended for implementation of
additional Logic for the SPS for 765 KV Sholapur
Raichur Line w.e.f 27.01.2014.
3 Modification in NTPC Talcher SPS
NLDC has proposed for modification in the SPS for secure operation of Grid after synchronization of SR with NEW Grid.
NTPC/CTU in consultation with NLDC and SRLDC
- -
2
Annexure-XIII
b. Status of implementation: SPS in Karnataka
SN Name of the Scheme Details of the scheme
Implementing Agency
28th PCSC Deliberations PCSC
Recommendations
1 Somanahally& Bangalore water supply
a) To trip all 220kV lines & 220 / 66kV trfs except 220 kV Harohalli&Tataguni lines at Somanahally and to trip Vrishabhavathi line at Tataguni when ICTs at Somanahally trip. b) To trip 220 kV Vajamangala and Madhuvanahally-1 & 2 lines at TK Hally when ICTs at Mysore trip.
KPTCL
KPTCL informed that the SPS is delayed due to ongoing R&M works at 220 KV Somanahalli SS.
The PCSC forum requested KPTCL to submit the SPS Logic to the SRPC Secretariat.
2 (i) SPS for Tripping of one of 400 KV Hiriyur Nelamangala D/C Line and flow on other line >850 MW (ii) SPS for tripping one of 400 KV Gooty Nelamangala S/C Line or 400 KV Gooty Somanahalli S/C Line and flow on the other line > 850 MW.
• In SR signal will be sent from Hiriyur to trigger 765 KV Raichur Sholapur SPS.
• 500 MW of additional loads in Southern Region to be identified which is separate from the loads identified for HVDC Kolar SPS and Kudankulam SPS.
KPTCL/PGCIL (i) KPTCL informed that they have identified Loads for Trip signal 1,2 and 3 of HVDC Kolar SPS. (ii) KPTCL informed that action would be taken for identification of separate loads for the proposed SPS based on the recommendations of PCSC forum.
-
ANNEXURE XIV
1
TANTRANSCO
From R.S.Alagappan,B.E., Chief Engineer, Protection and Communication, I Floor, 5 B Block, 144, Anna Salai, Chennai-2.
To The Member Secretary, SRPC, 29, Race Course Cross Road, Bangalore – 560 009.
Lr.No.CE/P&C/SE/D/ EPC 4/AEE3/F.SRPC /D. 02 /14 dt. 13 .01.2014.
Sir,
Sub: Islanding scheme - Modified S1- S2 block separation of Southern grid-
two stage Islanding – Implemented.
Ref: Lr.No.CE/P&C/SE/D/ EPC 2/AEE3/F.SRPC /D. 77 /13 dt. 26.08.2013.
***
Subsequent to the commissioning of units at Vallur the Stage I of Islanding
scheme has been modified. The modified S1- S2 two stage Islanding scheme as
approved in the 22nd meeting of SRPC has been implemented and is in service from
10.01.2014. The feeders connected to trip are furnished below.
Stage I:
The following feeders are connected to trip at 48.3Hz/Instantaneous.
SV Chatram 400kV SS 400kV Pondy feeder
Hosur 230kV SS 230kV Mettur Auto SS feeder 110kV Kariamangalam feeder
Singarapet 230kV SS 230kV Thiruvalam feeder 230kV Arani feeder 110kV Arani feeder 1&2
Villupuram 230kV SS 230kV Acharapakkam feeder 110kV Acharapakkam feeder 2 110kV Arani feeder
Villupuram 110kV SS 110kV Acharapakkam feeder 1
ANNEXURE XIV
2
Thiruvalam 230kV SS
230kV Chittoor feeder
Stage II
The following feeders are connected to trip at 47.9Hz/Instantaneous for block
isolation.
Alamathy 400kV SS
400kV Nellore feeders 1&2
Gummidipoondi 230kV SS
230kV Sulurpet feeder
Alundur 400kV SS
230kV Alagarkoil feeder
230kV Pudukottai feeder
230kV Pugalur feeder
Thiruvarur 230kV SS
230kV Karambium feeder
Myvadi 400kV SS
230kV Pugalur 400kV SS feeder 230kV Sembatti feeder
Pudansandai 230kV SS
230kV Unjanai feeder
230kV Deviakurichi feeder
Udumalpet 230kV SS
230kV Idukki feeder
Sembatti 230kV SS
110kV Alundur feeder
110kV Udumalpet feeder
Renganathapuram 230kV SS
110kV Udumalpet feeder
110kV Trichy feeder
ANNEXURE XIV
3
Karambium 230kV SS
110kV Thanjavur feeder
110kV Pattukottai feeder
Pugalur 230kV SS
110kV Iyermalai feeder
110kV Erode feeder
The following feeders in Chennai area are also connected to trip at
47.9Hz/Inst to obtain load relief for matching Generation and demand in the block.
ETPS 110kV Tondiarpet feeder
Tondiarpet 230kV SS 110kV ETPS feeder 110kV Manali feeder
NCTPS 230kV SS 230kV Athipattu
Manali 230kV SS 110kV CPCL feeder 110kV TPL feeder 110kV MFL 1&2 feeder 110kV Tondiarpet feeder 110kV Korattur feeder 110kV Panjetty feeder
Alamathy 400kV SS 110kV Auto LV
Korattur 230kV SS 110kV Sembium feeders 1&2 110kV Kadaperi feeders 1&2 110kV Sriperumpudur feeders 2 110kV Thirumangalam feeder 110kV Manali feeder All 33kV loads Mylapore 230kV SS 110kV Adayar feeder
BBGTPS 110kV Cooks Road feeder
ANNEXURE XIV
4
Sembium 110kV SS 110kV Korattur feeder 1 & 2
Gummidipoondi 230kV SS HV breakers 1&2 of Auto transformers.
Sunguvarchatram 400kV SS 230kV SIPCOT feeder 230kV Oragadam feeder 230kV Nokia feeder
Sriperumpudur 400kV SS LV Breakers of 400/110kV ICTs 230kV SIPCOT feeder 230kV Oragadam feeder 230kV Hyundai feeder 230kV Nokia feeder
Kilpauk 230kV SS 110kV Cooks Road feeder
Koyembedu 230kV SS 110kV K K Nagar feeder 110kV Kodambakkam feeder
Tharamani 230kV SS 230kV Veerapuram feeder 110kV Perungudi feeders 1&2 110kV SPKoil feeder - open 110kV Tidel park feeders 1&2
SPKoil 230kV SS 230kV Veerapuram feeder 230kV Oragadam feeder 110kV Tharamani feeder 110kV Kadaperi feeders 2 110kV Veerapuram feeder 110kV Oragadam feeder
Siruseri 230kV S 110kV Mambakkam feeder
Kadaperi 230kV SS Power transformer HV 1,2 &3 110kV Korattur feeder 1&2 110kV SPKoil feeder 2
ANNEXURE XIV
5
Acharapakkam 230kV SS 110kV Villupuram feeder 1&2
110kV SP Koil feeder 1&2
The above load matching in Chennai area will be reviewed as and when
generation picks up without changing the isolation points listed above.
Sd/..
Chief Engineer/P&C
Copy submitted to MD/Tantransco.
Copy submitted to Director/Operation.
Copy to Chief Engineer/Operation
Copy to Superintending Engineer/LD&GO/Chennai.
ANNEXURE XV
1
TANTRANSCO
From R.S.Alagappan,B.E., Chief Engineer, Protection and Communication, I Floor, 5 B Block, 144, Anna Salai, Chennai-2.
To The Member Secretary, SRPC, 29, Race Course Cross Road, Bangalore – 560 009.
Lr.No.CE/P&C/SE/D/ EPC 4/AEE3/F.SRPC /D. 03 /14 dt. 13.01.2014.
Sub: Group IV of AUFR & f+df/dt stage II scheme implemented- reg.
Ref: SRPC/SE-I/ 2013 dt 21.08.2013. ***
The following feeders are connected to trip in Group IV of UF at 48.6Hz/Inst. Chennai SLDC 110 KV Mosur - Pallur # 40 110 KV Mosur - Salai # 15 110kV Mosur- Thiruthani 30 Thiagadurgam 110 kV GC 20 Palyaseevaram 110 kV GC 20 Erode SLDC 110 KV Thundialur- Othakalmandapam 1 & 2 (b/e) 97 110 KV Arasur-Palladam 25 110 KV Salem - Deviakurichi 1& 2 (b/e) 140 110 KV Palladam - Thiruppur 52 110 kV Vembadaithalam GC 20 110 kV Pudhansandai - Namagiripet 10 110 KV Gobi - Erode @ both end 15 110 KV Hosur - Uthanapally 10 110 KV Pudhansandai- Namakkal 25 Madurai SLDC
110 KV Renganathapuram GC 22 110 KV Thiruvarur- Thiruthuraipoondi feeder 20 110 KV Kavanoor- Paramakudi Radial # 15 110 KV Thirupannadal- Thirupurambiyam feeder 8 110 KV Vaitheeswaran Koil – Thiruvenkadu feeder 8 110 KV Theni- Sembatty feeder I 20
110 KV Thiruvarur - Kovilveni feeder 20 110 KV Kodikurichi- Veerasigamani #2 20
Total 757
110 KV Sembatti-Pugalur
75 110 KV Pugalur-Kabilarmalai
30
ANNEXURE XV
2
The following feeders are connected to trip at 49.3Hz instantaneous with rate of
fall of frequency 0.3Hz/Sec
Both AUFR scheme and f+df/dt schemes are implemented in full and are in service from 10.01.2014.
Sd/...
Chief Engineer/P&C
Copy submitted to MD/Tantransco.
Copy submitted to Director/Operation.
Copy to Chief Engineer/Operation
Copy to Superintending Engineer/LD&GO/Chennai.
Name of feeder Load in MW 110 KV Mosur - Thiruvallur 27 110kV Kaveripakkam loads at SIPCOT 48 110kV Kavanoor - Kamudhi 70 110kV Alagarkoil - Karaikudi 55 110 KV Pugalur - Kabilarmalai 35 110 kV Pugalur - Pallapatti 40 110 KV Thiruvarur – Thanjavur 40 110 KV Perambalur – Thuraiyur 40 110 KV Harur GC 12 110kV Ramayanahalli GC 28 110 KV Hosur -Bagalur 22 110 KV Arasur – Annur feeder 2 35 110 KV Pudansandai – NG Pettai 10 110 KV Deviakurichi - Thalaivasal 11 110 KV Deviakurichi - Thammampatti 15 110 KV Palladam - Ingur 58 110 KV KR Thoppur - Vembadithalam 20 Total 566 MW
